By Ray Konopka
Contains the Delphi item Pascal item version. Covers VCL part structure, multi-control elements, and part DLLs. Explains part construction and debugging, and box defense and entry rights. Clarifies item Pascal exceptions and exception dealing with. exhibits you ways to exploit some of the top Delphi controls to be had to construct home windows functions. Tells approximately imposing houses, estate editors, and occasions and occasion handlers.
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Additional resources for Developing Custom Delphi Components
44 Chapter 2 Although class methods can also be called from an object instance, the implementation of class methods cannot reference any fields or normal methods of the class type. However, constructors and other class methods may be referenced. As a result, class methods usually modify global data, or return information about the class. Class methods combine the benefits of belonging to a class with the accessibility of a normal procedure or function. Even though these methods can be called without creating an object instance, class methods are still bound by the access rights specified in the class declaration.
These methods are called access methods. 1 shows a BP7 program that implements a bookcase object, complete with properties. This simple program demonstrates how traditional languages 49 50 Chapter 3 implement properties and, more importantly, how those properties are used in a program. The goal of this sample program is to create a three-shelf bookcase with a width of thirty inches and a depth of ten inches. After the number of shelves is modified, the total shelf space (in square inches) in calculated.
3 shows the effect this has on the program. 3 Handling the wm_LButtonDown message. 40 Chapter 2 Second, message-handling methods can always be specified for a class—even if the ancestor class defines a private method handling the same message. And finally, Delphi defines several custom message types that automatically extract the appropriate information from the standard Windows message structure. For example, the TWMLButtonDown message type is defined such that the X and Y coordinates of the mouse click, normally embedded into the low and high words of the LParam field of the message record, can be accessed by referencing the XPos and YPos fields, respectively.
Developing Custom Delphi Components by Ray Konopka